Calculated Cosmic-Ray Muon Spectra at High Energies (>20 GeV)

Abstract

Calculations of sea-level cosmic-ray muon spectra have been made at 75\ifmmode^\circ\else\textdegree\fi{}, 80\ifmmode^\circ\else\textdegree\fi{}, 85\ifmmode^\circ\else\textdegree\fi{}, and 88.75\ifmmode^\circ\else\textdegree\fi{} between 20 and 1000 GeV, and compared with measurements made at Argonne National Laboratory. Although the experimental results are a consistent 60% of the calculated values, leading to too few muons being found at high zenith angles, it is felt that this does not support the Utah anomaly, as the discrepancy is energy- and angle-independent. Similarly, no exotic processes, such as the failure of special relativity, seem to be operating.

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